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<pre><span class="sourceLineNo">001</span>/* ===========================================================<a name="line.1"></a>
<span class="sourceLineNo">002</span> * JFreeChart : a free chart library for the Java(tm) platform<a name="line.2"></a>
<span class="sourceLineNo">003</span> * ===========================================================<a name="line.3"></a>
<span class="sourceLineNo">004</span> *<a name="line.4"></a>
<span class="sourceLineNo">005</span> * (C) Copyright 2000-2011, by Object Refinery Limited and Contributors.<a name="line.5"></a>
<span class="sourceLineNo">006</span> *<a name="line.6"></a>
<span class="sourceLineNo">007</span> * Project Info:  http://www.jfree.org/jfreechart/index.html<a name="line.7"></a>
<span class="sourceLineNo">008</span> *<a name="line.8"></a>
<span class="sourceLineNo">009</span> * This library is free software; you can redistribute it and/or modify it<a name="line.9"></a>
<span class="sourceLineNo">010</span> * under the terms of the GNU Lesser General Public License as published by<a name="line.10"></a>
<span class="sourceLineNo">011</span> * the Free Software Foundation; either version 2.1 of the License, or<a name="line.11"></a>
<span class="sourceLineNo">012</span> * (at your option) any later version.<a name="line.12"></a>
<span class="sourceLineNo">013</span> *<a name="line.13"></a>
<span class="sourceLineNo">014</span> * This library is distributed in the hope that it will be useful, but<a name="line.14"></a>
<span class="sourceLineNo">015</span> * WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY<a name="line.15"></a>
<span class="sourceLineNo">016</span> * or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public<a name="line.16"></a>
<span class="sourceLineNo">017</span> * License for more details.<a name="line.17"></a>
<span class="sourceLineNo">018</span> *<a name="line.18"></a>
<span class="sourceLineNo">019</span> * You should have received a copy of the GNU Lesser General Public<a name="line.19"></a>
<span class="sourceLineNo">020</span> * License along with this library; if not, write to the Free Software<a name="line.20"></a>
<span class="sourceLineNo">021</span> * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301,<a name="line.21"></a>
<span class="sourceLineNo">022</span> * USA.<a name="line.22"></a>
<span class="sourceLineNo">023</span> *<a name="line.23"></a>
<span class="sourceLineNo">024</span> * [Oracle and Java are registered trademarks of Oracle and/or its affiliates. <a name="line.24"></a>
<span class="sourceLineNo">025</span> * Other names may be trademarks of their respective owners.]<a name="line.25"></a>
<span class="sourceLineNo">026</span> *<a name="line.26"></a>
<span class="sourceLineNo">027</span> * -------------------------<a name="line.27"></a>
<span class="sourceLineNo">028</span> * XYDifferenceRenderer.java<a name="line.28"></a>
<span class="sourceLineNo">029</span> * -------------------------<a name="line.29"></a>
<span class="sourceLineNo">030</span> * (C) Copyright 2003-2008, by Object Refinery Limited and Contributors.<a name="line.30"></a>
<span class="sourceLineNo">031</span> *<a name="line.31"></a>
<span class="sourceLineNo">032</span> * Original Author:  David Gilbert (for Object Refinery Limited);<a name="line.32"></a>
<span class="sourceLineNo">033</span> * Contributor(s):   Richard West, Advanced Micro Devices, Inc. (major rewrite<a name="line.33"></a>
<span class="sourceLineNo">034</span> *                   of difference drawing algorithm);<a name="line.34"></a>
<span class="sourceLineNo">035</span> *<a name="line.35"></a>
<span class="sourceLineNo">036</span> * Changes:<a name="line.36"></a>
<span class="sourceLineNo">037</span> * --------<a name="line.37"></a>
<span class="sourceLineNo">038</span> * 30-Apr-2003 : Version 1 (DG);<a name="line.38"></a>
<span class="sourceLineNo">039</span> * 30-Jul-2003 : Modified entity constructor (CZ);<a name="line.39"></a>
<span class="sourceLineNo">040</span> * 20-Aug-2003 : Implemented Cloneable and PublicCloneable (DG);<a name="line.40"></a>
<span class="sourceLineNo">041</span> * 16-Sep-2003 : Changed ChartRenderingInfo --&gt; PlotRenderingInfo (DG);<a name="line.41"></a>
<span class="sourceLineNo">042</span> * 09-Feb-2004 : Updated to support horizontal plot orientation (DG);<a name="line.42"></a>
<span class="sourceLineNo">043</span> * 10-Feb-2004 : Added default constructor, setter methods and updated<a name="line.43"></a>
<span class="sourceLineNo">044</span> *               Javadocs (DG);<a name="line.44"></a>
<span class="sourceLineNo">045</span> * 25-Feb-2004 : Replaced CrosshairInfo with CrosshairState (DG);<a name="line.45"></a>
<span class="sourceLineNo">046</span> * 30-Mar-2004 : Fixed bug in getNegativePaint() method (DG);<a name="line.46"></a>
<span class="sourceLineNo">047</span> * 15-Jul-2004 : Switched getX() with getXValue() and getY() with<a name="line.47"></a>
<span class="sourceLineNo">048</span> *               getYValue() (DG);<a name="line.48"></a>
<span class="sourceLineNo">049</span> * 25-Aug-2004 : Fixed a bug preventing the use of crosshairs (DG);<a name="line.49"></a>
<span class="sourceLineNo">050</span> * 11-Nov-2004 : Now uses ShapeUtilities to translate shapes (DG);<a name="line.50"></a>
<span class="sourceLineNo">051</span> * 19-Jan-2005 : Now accesses only primitive values from dataset (DG);<a name="line.51"></a>
<span class="sourceLineNo">052</span> * 22-Feb-2005 : Override getLegendItem(int, int) to return "line" items (DG);<a name="line.52"></a>
<span class="sourceLineNo">053</span> * 13-Apr-2005 : Fixed shape positioning bug (id = 1182062) (DG);<a name="line.53"></a>
<span class="sourceLineNo">054</span> * 20-Apr-2005 : Use generators for legend tooltips and URLs (DG);<a name="line.54"></a>
<span class="sourceLineNo">055</span> * 04-May-2005 : Override equals() method, renamed get/setPlotShapes() --&gt;<a name="line.55"></a>
<span class="sourceLineNo">056</span> *               get/setShapesVisible (DG);<a name="line.56"></a>
<span class="sourceLineNo">057</span> * 09-Jun-2005 : Updated equals() to handle GradientPaint (DG);<a name="line.57"></a>
<span class="sourceLineNo">058</span> * 16-Jun-2005 : Fix bug (1221021) affecting stroke used for each series (DG);<a name="line.58"></a>
<span class="sourceLineNo">059</span> * ------------- JFREECHART 1.0.x ---------------------------------------------<a name="line.59"></a>
<span class="sourceLineNo">060</span> * 24-Jan-2007 : Added flag to allow rounding of x-coordinates, and fixed<a name="line.60"></a>
<span class="sourceLineNo">061</span> *               bug in clone() (DG);<a name="line.61"></a>
<span class="sourceLineNo">062</span> * 05-Feb-2007 : Added an extra call to updateCrosshairValues() in<a name="line.62"></a>
<span class="sourceLineNo">063</span> *               drawItemPass1(), to fix bug 1564967 (DG);<a name="line.63"></a>
<span class="sourceLineNo">064</span> * 06-Feb-2007 : Fixed bug 1086307, crosshairs with multiple axes (DG);<a name="line.64"></a>
<span class="sourceLineNo">065</span> * 08-Mar-2007 : Fixed entity generation (DG);<a name="line.65"></a>
<span class="sourceLineNo">066</span> * 20-Apr-2007 : Updated getLegendItem() for renderer change (DG);<a name="line.66"></a>
<span class="sourceLineNo">067</span> * 23-Apr-2007 : Rewrite of difference drawing algorithm to allow use of<a name="line.67"></a>
<span class="sourceLineNo">068</span> *               series with disjoint x-values (RW);<a name="line.68"></a>
<span class="sourceLineNo">069</span> * 04-May-2007 : Set processVisibleItemsOnly flag to false (DG);<a name="line.69"></a>
<span class="sourceLineNo">070</span> * 17-May-2007 : Set datasetIndex and seriesIndex in getLegendItem() (DG);<a name="line.70"></a>
<span class="sourceLineNo">071</span> * 18-May-2007 : Set dataset and seriesKey for LegendItem (DG);<a name="line.71"></a>
<span class="sourceLineNo">072</span> * 05-Nov-2007 : Draw item labels if visible (RW);<a name="line.72"></a>
<span class="sourceLineNo">073</span> * 17-Jun-2008 : Apply legend shape, font and paint attributes (DG);<a name="line.73"></a>
<span class="sourceLineNo">074</span> *<a name="line.74"></a>
<span class="sourceLineNo">075</span> */<a name="line.75"></a>
<span class="sourceLineNo">076</span><a name="line.76"></a>
<span class="sourceLineNo">077</span>package org.jfree.chart.renderer.xy;<a name="line.77"></a>
<span class="sourceLineNo">078</span><a name="line.78"></a>
<span class="sourceLineNo">079</span>import java.awt.Color;<a name="line.79"></a>
<span class="sourceLineNo">080</span>import java.awt.Graphics2D;<a name="line.80"></a>
<span class="sourceLineNo">081</span>import java.awt.Paint;<a name="line.81"></a>
<span class="sourceLineNo">082</span>import java.awt.Shape;<a name="line.82"></a>
<span class="sourceLineNo">083</span>import java.awt.Stroke;<a name="line.83"></a>
<span class="sourceLineNo">084</span>import java.awt.geom.GeneralPath;<a name="line.84"></a>
<span class="sourceLineNo">085</span>import java.awt.geom.Line2D;<a name="line.85"></a>
<span class="sourceLineNo">086</span>import java.awt.geom.Rectangle2D;<a name="line.86"></a>
<span class="sourceLineNo">087</span>import java.io.IOException;<a name="line.87"></a>
<span class="sourceLineNo">088</span>import java.io.ObjectInputStream;<a name="line.88"></a>
<span class="sourceLineNo">089</span>import java.io.ObjectOutputStream;<a name="line.89"></a>
<span class="sourceLineNo">090</span>import java.util.Collections;<a name="line.90"></a>
<span class="sourceLineNo">091</span>import java.util.LinkedList;<a name="line.91"></a>
<span class="sourceLineNo">092</span><a name="line.92"></a>
<span class="sourceLineNo">093</span>import org.jfree.chart.LegendItem;<a name="line.93"></a>
<span class="sourceLineNo">094</span>import org.jfree.chart.axis.ValueAxis;<a name="line.94"></a>
<span class="sourceLineNo">095</span>import org.jfree.chart.entity.EntityCollection;<a name="line.95"></a>
<span class="sourceLineNo">096</span>import org.jfree.chart.entity.XYItemEntity;<a name="line.96"></a>
<span class="sourceLineNo">097</span>import org.jfree.chart.event.RendererChangeEvent;<a name="line.97"></a>
<span class="sourceLineNo">098</span>import org.jfree.chart.labels.XYToolTipGenerator;<a name="line.98"></a>
<span class="sourceLineNo">099</span>import org.jfree.chart.plot.CrosshairState;<a name="line.99"></a>
<span class="sourceLineNo">100</span>import org.jfree.chart.plot.PlotOrientation;<a name="line.100"></a>
<span class="sourceLineNo">101</span>import org.jfree.chart.plot.PlotRenderingInfo;<a name="line.101"></a>
<span class="sourceLineNo">102</span>import org.jfree.chart.plot.XYPlot;<a name="line.102"></a>
<span class="sourceLineNo">103</span>import org.jfree.chart.urls.XYURLGenerator;<a name="line.103"></a>
<span class="sourceLineNo">104</span>import org.jfree.data.xy.XYDataset;<a name="line.104"></a>
<span class="sourceLineNo">105</span>import org.jfree.io.SerialUtilities;<a name="line.105"></a>
<span class="sourceLineNo">106</span>import org.jfree.ui.RectangleEdge;<a name="line.106"></a>
<span class="sourceLineNo">107</span>import org.jfree.util.PaintUtilities;<a name="line.107"></a>
<span class="sourceLineNo">108</span>import org.jfree.util.PublicCloneable;<a name="line.108"></a>
<span class="sourceLineNo">109</span>import org.jfree.util.ShapeUtilities;<a name="line.109"></a>
<span class="sourceLineNo">110</span><a name="line.110"></a>
<span class="sourceLineNo">111</span>/**<a name="line.111"></a>
<span class="sourceLineNo">112</span> * A renderer for an {@link XYPlot} that highlights the differences between two<a name="line.112"></a>
<span class="sourceLineNo">113</span> * series.  The example shown here is generated by the<a name="line.113"></a>
<span class="sourceLineNo">114</span> * &lt;code&gt;DifferenceChartDemo1.java&lt;/code&gt; program included in the JFreeChart<a name="line.114"></a>
<span class="sourceLineNo">115</span> * demo collection:<a name="line.115"></a>
<span class="sourceLineNo">116</span> * &lt;br&gt;&lt;br&gt;<a name="line.116"></a>
<span class="sourceLineNo">117</span> * &lt;img src="../../../../../images/XYDifferenceRendererSample.png"<a name="line.117"></a>
<span class="sourceLineNo">118</span> * alt="XYDifferenceRendererSample.png" /&gt;<a name="line.118"></a>
<span class="sourceLineNo">119</span> */<a name="line.119"></a>
<span class="sourceLineNo">120</span>public class XYDifferenceRenderer extends AbstractXYItemRenderer<a name="line.120"></a>
<span class="sourceLineNo">121</span>        implements XYItemRenderer, PublicCloneable {<a name="line.121"></a>
<span class="sourceLineNo">122</span><a name="line.122"></a>
<span class="sourceLineNo">123</span>    /** For serialization. */<a name="line.123"></a>
<span class="sourceLineNo">124</span>    private static final long serialVersionUID = -8447915602375584857L;<a name="line.124"></a>
<span class="sourceLineNo">125</span><a name="line.125"></a>
<span class="sourceLineNo">126</span>    /** The paint used to highlight positive differences (y(0) &gt; y(1)). */<a name="line.126"></a>
<span class="sourceLineNo">127</span>    private transient Paint positivePaint;<a name="line.127"></a>
<span class="sourceLineNo">128</span><a name="line.128"></a>
<span class="sourceLineNo">129</span>    /** The paint used to highlight negative differences (y(0) &lt; y(1)). */<a name="line.129"></a>
<span class="sourceLineNo">130</span>    private transient Paint negativePaint;<a name="line.130"></a>
<span class="sourceLineNo">131</span><a name="line.131"></a>
<span class="sourceLineNo">132</span>    /** Display shapes at each point? */<a name="line.132"></a>
<span class="sourceLineNo">133</span>    private boolean shapesVisible;<a name="line.133"></a>
<span class="sourceLineNo">134</span><a name="line.134"></a>
<span class="sourceLineNo">135</span>    /** The shape to display in the legend item. */<a name="line.135"></a>
<span class="sourceLineNo">136</span>    private transient Shape legendLine;<a name="line.136"></a>
<span class="sourceLineNo">137</span><a name="line.137"></a>
<span class="sourceLineNo">138</span>    /**<a name="line.138"></a>
<span class="sourceLineNo">139</span>     * This flag controls whether or not the x-coordinates (in Java2D space)<a name="line.139"></a>
<span class="sourceLineNo">140</span>     * are rounded to integers.  When set to true, this can avoid the vertical<a name="line.140"></a>
<span class="sourceLineNo">141</span>     * striping that anti-aliasing can generate.  However, the rounding may not<a name="line.141"></a>
<span class="sourceLineNo">142</span>     * be appropriate for output in high resolution formats (for example,<a name="line.142"></a>
<span class="sourceLineNo">143</span>     * vector graphics formats such as SVG and PDF).<a name="line.143"></a>
<span class="sourceLineNo">144</span>     *<a name="line.144"></a>
<span class="sourceLineNo">145</span>     * @since 1.0.4<a name="line.145"></a>
<span class="sourceLineNo">146</span>     */<a name="line.146"></a>
<span class="sourceLineNo">147</span>    private boolean roundXCoordinates;<a name="line.147"></a>
<span class="sourceLineNo">148</span><a name="line.148"></a>
<span class="sourceLineNo">149</span>    /**<a name="line.149"></a>
<span class="sourceLineNo">150</span>     * Creates a new renderer with default attributes.<a name="line.150"></a>
<span class="sourceLineNo">151</span>     */<a name="line.151"></a>
<span class="sourceLineNo">152</span>    public XYDifferenceRenderer() {<a name="line.152"></a>
<span class="sourceLineNo">153</span>        this(Color.green, Color.red, false);<a name="line.153"></a>
<span class="sourceLineNo">154</span>    }<a name="line.154"></a>
<span class="sourceLineNo">155</span><a name="line.155"></a>
<span class="sourceLineNo">156</span>    /**<a name="line.156"></a>
<span class="sourceLineNo">157</span>     * Creates a new renderer.<a name="line.157"></a>
<span class="sourceLineNo">158</span>     *<a name="line.158"></a>
<span class="sourceLineNo">159</span>     * @param positivePaint  the highlight color for positive differences<a name="line.159"></a>
<span class="sourceLineNo">160</span>     *                       (&lt;code&gt;null&lt;/code&gt; not permitted).<a name="line.160"></a>
<span class="sourceLineNo">161</span>     * @param negativePaint  the highlight color for negative differences<a name="line.161"></a>
<span class="sourceLineNo">162</span>     *                       (&lt;code&gt;null&lt;/code&gt; not permitted).<a name="line.162"></a>
<span class="sourceLineNo">163</span>     * @param shapes  draw shapes?<a name="line.163"></a>
<span class="sourceLineNo">164</span>     */<a name="line.164"></a>
<span class="sourceLineNo">165</span>    public XYDifferenceRenderer(Paint positivePaint, Paint negativePaint,<a name="line.165"></a>
<span class="sourceLineNo">166</span>                                boolean shapes) {<a name="line.166"></a>
<span class="sourceLineNo">167</span>        if (positivePaint == null) {<a name="line.167"></a>
<span class="sourceLineNo">168</span>            throw new IllegalArgumentException(<a name="line.168"></a>
<span class="sourceLineNo">169</span>                    "Null 'positivePaint' argument.");<a name="line.169"></a>
<span class="sourceLineNo">170</span>        }<a name="line.170"></a>
<span class="sourceLineNo">171</span>        if (negativePaint == null) {<a name="line.171"></a>
<span class="sourceLineNo">172</span>            throw new IllegalArgumentException(<a name="line.172"></a>
<span class="sourceLineNo">173</span>                    "Null 'negativePaint' argument.");<a name="line.173"></a>
<span class="sourceLineNo">174</span>        }<a name="line.174"></a>
<span class="sourceLineNo">175</span>        this.positivePaint = positivePaint;<a name="line.175"></a>
<span class="sourceLineNo">176</span>        this.negativePaint = negativePaint;<a name="line.176"></a>
<span class="sourceLineNo">177</span>        this.shapesVisible = shapes;<a name="line.177"></a>
<span class="sourceLineNo">178</span>        this.legendLine = new Line2D.Double(-7.0, 0.0, 7.0, 0.0);<a name="line.178"></a>
<span class="sourceLineNo">179</span>        this.roundXCoordinates = false;<a name="line.179"></a>
<span class="sourceLineNo">180</span>    }<a name="line.180"></a>
<span class="sourceLineNo">181</span><a name="line.181"></a>
<span class="sourceLineNo">182</span>    /**<a name="line.182"></a>
<span class="sourceLineNo">183</span>     * Returns the paint used to highlight positive differences.<a name="line.183"></a>
<span class="sourceLineNo">184</span>     *<a name="line.184"></a>
<span class="sourceLineNo">185</span>     * @return The paint (never &lt;code&gt;null&lt;/code&gt;).<a name="line.185"></a>
<span class="sourceLineNo">186</span>     *<a name="line.186"></a>
<span class="sourceLineNo">187</span>     * @see #setPositivePaint(Paint)<a name="line.187"></a>
<span class="sourceLineNo">188</span>     */<a name="line.188"></a>
<span class="sourceLineNo">189</span>    public Paint getPositivePaint() {<a name="line.189"></a>
<span class="sourceLineNo">190</span>        return this.positivePaint;<a name="line.190"></a>
<span class="sourceLineNo">191</span>    }<a name="line.191"></a>
<span class="sourceLineNo">192</span><a name="line.192"></a>
<span class="sourceLineNo">193</span>    /**<a name="line.193"></a>
<span class="sourceLineNo">194</span>     * Sets the paint used to highlight positive differences and sends a<a name="line.194"></a>
<span class="sourceLineNo">195</span>     * {@link RendererChangeEvent} to all registered listeners.<a name="line.195"></a>
<span class="sourceLineNo">196</span>     *<a name="line.196"></a>
<span class="sourceLineNo">197</span>     * @param paint  the paint (&lt;code&gt;null&lt;/code&gt; not permitted).<a name="line.197"></a>
<span class="sourceLineNo">198</span>     *<a name="line.198"></a>
<span class="sourceLineNo">199</span>     * @see #getPositivePaint()<a name="line.199"></a>
<span class="sourceLineNo">200</span>     */<a name="line.200"></a>
<span class="sourceLineNo">201</span>    public void setPositivePaint(Paint paint) {<a name="line.201"></a>
<span class="sourceLineNo">202</span>        if (paint == null) {<a name="line.202"></a>
<span class="sourceLineNo">203</span>            throw new IllegalArgumentException("Null 'paint' argument.");<a name="line.203"></a>
<span class="sourceLineNo">204</span>        }<a name="line.204"></a>
<span class="sourceLineNo">205</span>        this.positivePaint = paint;<a name="line.205"></a>
<span class="sourceLineNo">206</span>        fireChangeEvent();<a name="line.206"></a>
<span class="sourceLineNo">207</span>    }<a name="line.207"></a>
<span class="sourceLineNo">208</span><a name="line.208"></a>
<span class="sourceLineNo">209</span>    /**<a name="line.209"></a>
<span class="sourceLineNo">210</span>     * Returns the paint used to highlight negative differences.<a name="line.210"></a>
<span class="sourceLineNo">211</span>     *<a name="line.211"></a>
<span class="sourceLineNo">212</span>     * @return The paint (never &lt;code&gt;null&lt;/code&gt;).<a name="line.212"></a>
<span class="sourceLineNo">213</span>     *<a name="line.213"></a>
<span class="sourceLineNo">214</span>     * @see #setNegativePaint(Paint)<a name="line.214"></a>
<span class="sourceLineNo">215</span>     */<a name="line.215"></a>
<span class="sourceLineNo">216</span>    public Paint getNegativePaint() {<a name="line.216"></a>
<span class="sourceLineNo">217</span>        return this.negativePaint;<a name="line.217"></a>
<span class="sourceLineNo">218</span>    }<a name="line.218"></a>
<span class="sourceLineNo">219</span><a name="line.219"></a>
<span class="sourceLineNo">220</span>    /**<a name="line.220"></a>
<span class="sourceLineNo">221</span>     * Sets the paint used to highlight negative differences.<a name="line.221"></a>
<span class="sourceLineNo">222</span>     *<a name="line.222"></a>
<span class="sourceLineNo">223</span>     * @param paint  the paint (&lt;code&gt;null&lt;/code&gt; not permitted).<a name="line.223"></a>
<span class="sourceLineNo">224</span>     *<a name="line.224"></a>
<span class="sourceLineNo">225</span>     * @see #getNegativePaint()<a name="line.225"></a>
<span class="sourceLineNo">226</span>     */<a name="line.226"></a>
<span class="sourceLineNo">227</span>    public void setNegativePaint(Paint paint) {<a name="line.227"></a>
<span class="sourceLineNo">228</span>        if (paint == null) {<a name="line.228"></a>
<span class="sourceLineNo">229</span>            throw new IllegalArgumentException("Null 'paint' argument.");<a name="line.229"></a>
<span class="sourceLineNo">230</span>        }<a name="line.230"></a>
<span class="sourceLineNo">231</span>        this.negativePaint = paint;<a name="line.231"></a>
<span class="sourceLineNo">232</span>        notifyListeners(new RendererChangeEvent(this));<a name="line.232"></a>
<span class="sourceLineNo">233</span>    }<a name="line.233"></a>
<span class="sourceLineNo">234</span><a name="line.234"></a>
<span class="sourceLineNo">235</span>    /**<a name="line.235"></a>
<span class="sourceLineNo">236</span>     * Returns a flag that controls whether or not shapes are drawn for each<a name="line.236"></a>
<span class="sourceLineNo">237</span>     * data value.<a name="line.237"></a>
<span class="sourceLineNo">238</span>     *<a name="line.238"></a>
<span class="sourceLineNo">239</span>     * @return A boolean.<a name="line.239"></a>
<span class="sourceLineNo">240</span>     *<a name="line.240"></a>
<span class="sourceLineNo">241</span>     * @see #setShapesVisible(boolean)<a name="line.241"></a>
<span class="sourceLineNo">242</span>     */<a name="line.242"></a>
<span class="sourceLineNo">243</span>    public boolean getShapesVisible() {<a name="line.243"></a>
<span class="sourceLineNo">244</span>        return this.shapesVisible;<a name="line.244"></a>
<span class="sourceLineNo">245</span>    }<a name="line.245"></a>
<span class="sourceLineNo">246</span><a name="line.246"></a>
<span class="sourceLineNo">247</span>    /**<a name="line.247"></a>
<span class="sourceLineNo">248</span>     * Sets a flag that controls whether or not shapes are drawn for each<a name="line.248"></a>
<span class="sourceLineNo">249</span>     * data value, and sends a {@link RendererChangeEvent} to all registered<a name="line.249"></a>
<span class="sourceLineNo">250</span>     * listeners.<a name="line.250"></a>
<span class="sourceLineNo">251</span>     *<a name="line.251"></a>
<span class="sourceLineNo">252</span>     * @param flag  the flag.<a name="line.252"></a>
<span class="sourceLineNo">253</span>     *<a name="line.253"></a>
<span class="sourceLineNo">254</span>     * @see #getShapesVisible()<a name="line.254"></a>
<span class="sourceLineNo">255</span>     */<a name="line.255"></a>
<span class="sourceLineNo">256</span>    public void setShapesVisible(boolean flag) {<a name="line.256"></a>
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<span class="sourceLineNo">258</span>        fireChangeEvent();<a name="line.258"></a>
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<span class="sourceLineNo">260</span><a name="line.260"></a>
<span class="sourceLineNo">261</span>    /**<a name="line.261"></a>
<span class="sourceLineNo">262</span>     * Returns the shape used to represent a line in the legend.<a name="line.262"></a>
<span class="sourceLineNo">263</span>     *<a name="line.263"></a>
<span class="sourceLineNo">264</span>     * @return The legend line (never &lt;code&gt;null&lt;/code&gt;).<a name="line.264"></a>
<span class="sourceLineNo">265</span>     *<a name="line.265"></a>
<span class="sourceLineNo">266</span>     * @see #setLegendLine(Shape)<a name="line.266"></a>
<span class="sourceLineNo">267</span>     */<a name="line.267"></a>
<span class="sourceLineNo">268</span>    public Shape getLegendLine() {<a name="line.268"></a>
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<span class="sourceLineNo">271</span><a name="line.271"></a>
<span class="sourceLineNo">272</span>    /**<a name="line.272"></a>
<span class="sourceLineNo">273</span>     * Sets the shape used as a line in each legend item and sends a<a name="line.273"></a>
<span class="sourceLineNo">274</span>     * {@link RendererChangeEvent} to all registered listeners.<a name="line.274"></a>
<span class="sourceLineNo">275</span>     *<a name="line.275"></a>
<span class="sourceLineNo">276</span>     * @param line  the line (&lt;code&gt;null&lt;/code&gt; not permitted).<a name="line.276"></a>
<span class="sourceLineNo">277</span>     *<a name="line.277"></a>
<span class="sourceLineNo">278</span>     * @see #getLegendLine()<a name="line.278"></a>
<span class="sourceLineNo">279</span>     */<a name="line.279"></a>
<span class="sourceLineNo">280</span>    public void setLegendLine(Shape line) {<a name="line.280"></a>
<span class="sourceLineNo">281</span>        if (line == null) {<a name="line.281"></a>
<span class="sourceLineNo">282</span>            throw new IllegalArgumentException("Null 'line' argument.");<a name="line.282"></a>
<span class="sourceLineNo">283</span>        }<a name="line.283"></a>
<span class="sourceLineNo">284</span>        this.legendLine = line;<a name="line.284"></a>
<span class="sourceLineNo">285</span>        fireChangeEvent();<a name="line.285"></a>
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<span class="sourceLineNo">287</span><a name="line.287"></a>
<span class="sourceLineNo">288</span>    /**<a name="line.288"></a>
<span class="sourceLineNo">289</span>     * Returns the flag that controls whether or not the x-coordinates (in<a name="line.289"></a>
<span class="sourceLineNo">290</span>     * Java2D space) are rounded to integer values.<a name="line.290"></a>
<span class="sourceLineNo">291</span>     *<a name="line.291"></a>
<span class="sourceLineNo">292</span>     * @return The flag.<a name="line.292"></a>
<span class="sourceLineNo">293</span>     *<a name="line.293"></a>
<span class="sourceLineNo">294</span>     * @since 1.0.4<a name="line.294"></a>
<span class="sourceLineNo">295</span>     *<a name="line.295"></a>
<span class="sourceLineNo">296</span>     * @see #setRoundXCoordinates(boolean)<a name="line.296"></a>
<span class="sourceLineNo">297</span>     */<a name="line.297"></a>
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<span class="sourceLineNo">301</span><a name="line.301"></a>
<span class="sourceLineNo">302</span>    /**<a name="line.302"></a>
<span class="sourceLineNo">303</span>     * Sets the flag that controls whether or not the x-coordinates (in<a name="line.303"></a>
<span class="sourceLineNo">304</span>     * Java2D space) are rounded to integer values, and sends a<a name="line.304"></a>
<span class="sourceLineNo">305</span>     * {@link RendererChangeEvent} to all registered listeners.<a name="line.305"></a>
<span class="sourceLineNo">306</span>     *<a name="line.306"></a>
<span class="sourceLineNo">307</span>     * @param round  the new flag value.<a name="line.307"></a>
<span class="sourceLineNo">308</span>     *<a name="line.308"></a>
<span class="sourceLineNo">309</span>     * @since 1.0.4<a name="line.309"></a>
<span class="sourceLineNo">310</span>     *<a name="line.310"></a>
<span class="sourceLineNo">311</span>     * @see #getRoundXCoordinates()<a name="line.311"></a>
<span class="sourceLineNo">312</span>     */<a name="line.312"></a>
<span class="sourceLineNo">313</span>    public void setRoundXCoordinates(boolean round) {<a name="line.313"></a>
<span class="sourceLineNo">314</span>        this.roundXCoordinates = round;<a name="line.314"></a>
<span class="sourceLineNo">315</span>        fireChangeEvent();<a name="line.315"></a>
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<span class="sourceLineNo">317</span><a name="line.317"></a>
<span class="sourceLineNo">318</span>    /**<a name="line.318"></a>
<span class="sourceLineNo">319</span>     * Initialises the renderer and returns a state object that should be<a name="line.319"></a>
<span class="sourceLineNo">320</span>     * passed to subsequent calls to the drawItem() method.  This method will<a name="line.320"></a>
<span class="sourceLineNo">321</span>     * be called before the first item is rendered, giving the renderer an<a name="line.321"></a>
<span class="sourceLineNo">322</span>     * opportunity to initialise any state information it wants to maintain.<a name="line.322"></a>
<span class="sourceLineNo">323</span>     * The renderer can do nothing if it chooses.<a name="line.323"></a>
<span class="sourceLineNo">324</span>     *<a name="line.324"></a>
<span class="sourceLineNo">325</span>     * @param g2  the graphics device.<a name="line.325"></a>
<span class="sourceLineNo">326</span>     * @param dataArea  the area inside the axes.<a name="line.326"></a>
<span class="sourceLineNo">327</span>     * @param plot  the plot.<a name="line.327"></a>
<span class="sourceLineNo">328</span>     * @param data  the data.<a name="line.328"></a>
<span class="sourceLineNo">329</span>     * @param info  an optional info collection object to return data back to<a name="line.329"></a>
<span class="sourceLineNo">330</span>     *              the caller.<a name="line.330"></a>
<span class="sourceLineNo">331</span>     *<a name="line.331"></a>
<span class="sourceLineNo">332</span>     * @return A state object.<a name="line.332"></a>
<span class="sourceLineNo">333</span>     */<a name="line.333"></a>
<span class="sourceLineNo">334</span>    public XYItemRendererState initialise(Graphics2D g2,<a name="line.334"></a>
<span class="sourceLineNo">335</span>                                          Rectangle2D dataArea,<a name="line.335"></a>
<span class="sourceLineNo">336</span>                                          XYPlot plot,<a name="line.336"></a>
<span class="sourceLineNo">337</span>                                          XYDataset data,<a name="line.337"></a>
<span class="sourceLineNo">338</span>                                          PlotRenderingInfo info) {<a name="line.338"></a>
<span class="sourceLineNo">339</span><a name="line.339"></a>
<span class="sourceLineNo">340</span>        XYItemRendererState state = super.initialise(g2, dataArea, plot, data,<a name="line.340"></a>
<span class="sourceLineNo">341</span>                info);<a name="line.341"></a>
<span class="sourceLineNo">342</span>        state.setProcessVisibleItemsOnly(false);<a name="line.342"></a>
<span class="sourceLineNo">343</span>        return state;<a name="line.343"></a>
<span class="sourceLineNo">344</span><a name="line.344"></a>
<span class="sourceLineNo">345</span>    }<a name="line.345"></a>
<span class="sourceLineNo">346</span><a name="line.346"></a>
<span class="sourceLineNo">347</span>    /**<a name="line.347"></a>
<span class="sourceLineNo">348</span>     * Returns &lt;code&gt;2&lt;/code&gt;, the number of passes required by the renderer.<a name="line.348"></a>
<span class="sourceLineNo">349</span>     * The {@link XYPlot} will run through the dataset this number of times.<a name="line.349"></a>
<span class="sourceLineNo">350</span>     *<a name="line.350"></a>
<span class="sourceLineNo">351</span>     * @return The number of passes required by the renderer.<a name="line.351"></a>
<span class="sourceLineNo">352</span>     */<a name="line.352"></a>
<span class="sourceLineNo">353</span>    public int getPassCount() {<a name="line.353"></a>
<span class="sourceLineNo">354</span>        return 2;<a name="line.354"></a>
<span class="sourceLineNo">355</span>    }<a name="line.355"></a>
<span class="sourceLineNo">356</span><a name="line.356"></a>
<span class="sourceLineNo">357</span>    /**<a name="line.357"></a>
<span class="sourceLineNo">358</span>     * Draws the visual representation of a single data item.<a name="line.358"></a>
<span class="sourceLineNo">359</span>     *<a name="line.359"></a>
<span class="sourceLineNo">360</span>     * @param g2  the graphics device.<a name="line.360"></a>
<span class="sourceLineNo">361</span>     * @param state  the renderer state.<a name="line.361"></a>
<span class="sourceLineNo">362</span>     * @param dataArea  the area within which the data is being drawn.<a name="line.362"></a>
<span class="sourceLineNo">363</span>     * @param info  collects information about the drawing.<a name="line.363"></a>
<span class="sourceLineNo">364</span>     * @param plot  the plot (can be used to obtain standard color<a name="line.364"></a>
<span class="sourceLineNo">365</span>     *              information etc).<a name="line.365"></a>
<span class="sourceLineNo">366</span>     * @param domainAxis  the domain (horizontal) axis.<a name="line.366"></a>
<span class="sourceLineNo">367</span>     * @param rangeAxis  the range (vertical) axis.<a name="line.367"></a>
<span class="sourceLineNo">368</span>     * @param dataset  the dataset.<a name="line.368"></a>
<span class="sourceLineNo">369</span>     * @param series  the series index (zero-based).<a name="line.369"></a>
<span class="sourceLineNo">370</span>     * @param item  the item index (zero-based).<a name="line.370"></a>
<span class="sourceLineNo">371</span>     * @param crosshairState  crosshair information for the plot<a name="line.371"></a>
<span class="sourceLineNo">372</span>     *                        (&lt;code&gt;null&lt;/code&gt; permitted).<a name="line.372"></a>
<span class="sourceLineNo">373</span>     * @param pass  the pass index.<a name="line.373"></a>
<span class="sourceLineNo">374</span>     */<a name="line.374"></a>
<span class="sourceLineNo">375</span>    public void drawItem(Graphics2D g2,<a name="line.375"></a>
<span class="sourceLineNo">376</span>                         XYItemRendererState state,<a name="line.376"></a>
<span class="sourceLineNo">377</span>                         Rectangle2D dataArea,<a name="line.377"></a>
<span class="sourceLineNo">378</span>                         PlotRenderingInfo info,<a name="line.378"></a>
<span class="sourceLineNo">379</span>                         XYPlot plot,<a name="line.379"></a>
<span class="sourceLineNo">380</span>                         ValueAxis domainAxis,<a name="line.380"></a>
<span class="sourceLineNo">381</span>                         ValueAxis rangeAxis,<a name="line.381"></a>
<span class="sourceLineNo">382</span>                         XYDataset dataset,<a name="line.382"></a>
<span class="sourceLineNo">383</span>                         int series,<a name="line.383"></a>
<span class="sourceLineNo">384</span>                         int item,<a name="line.384"></a>
<span class="sourceLineNo">385</span>                         CrosshairState crosshairState,<a name="line.385"></a>
<span class="sourceLineNo">386</span>                         int pass) {<a name="line.386"></a>
<span class="sourceLineNo">387</span><a name="line.387"></a>
<span class="sourceLineNo">388</span>        if (pass == 0) {<a name="line.388"></a>
<span class="sourceLineNo">389</span>            drawItemPass0(g2, dataArea, info, plot, domainAxis, rangeAxis,<a name="line.389"></a>
<span class="sourceLineNo">390</span>                    dataset, series, item, crosshairState);<a name="line.390"></a>
<span class="sourceLineNo">391</span>        }<a name="line.391"></a>
<span class="sourceLineNo">392</span>        else if (pass == 1) {<a name="line.392"></a>
<span class="sourceLineNo">393</span>            drawItemPass1(g2, dataArea, info, plot, domainAxis, rangeAxis,<a name="line.393"></a>
<span class="sourceLineNo">394</span>                    dataset, series, item, crosshairState);<a name="line.394"></a>
<span class="sourceLineNo">395</span>        }<a name="line.395"></a>
<span class="sourceLineNo">396</span><a name="line.396"></a>
<span class="sourceLineNo">397</span>    }<a name="line.397"></a>
<span class="sourceLineNo">398</span><a name="line.398"></a>
<span class="sourceLineNo">399</span>    /**<a name="line.399"></a>
<span class="sourceLineNo">400</span>     * Draws the visual representation of a single data item, first pass.<a name="line.400"></a>
<span class="sourceLineNo">401</span>     *<a name="line.401"></a>
<span class="sourceLineNo">402</span>     * @param x_graphics  the graphics device.<a name="line.402"></a>
<span class="sourceLineNo">403</span>     * @param x_dataArea  the area within which the data is being drawn.<a name="line.403"></a>
<span class="sourceLineNo">404</span>     * @param x_info  collects information about the drawing.<a name="line.404"></a>
<span class="sourceLineNo">405</span>     * @param x_plot  the plot (can be used to obtain standard color<a name="line.405"></a>
<span class="sourceLineNo">406</span>     *                information etc).<a name="line.406"></a>
<span class="sourceLineNo">407</span>     * @param x_domainAxis  the domain (horizontal) axis.<a name="line.407"></a>
<span class="sourceLineNo">408</span>     * @param x_rangeAxis  the range (vertical) axis.<a name="line.408"></a>
<span class="sourceLineNo">409</span>     * @param x_dataset  the dataset.<a name="line.409"></a>
<span class="sourceLineNo">410</span>     * @param x_series  the series index (zero-based).<a name="line.410"></a>
<span class="sourceLineNo">411</span>     * @param x_item  the item index (zero-based).<a name="line.411"></a>
<span class="sourceLineNo">412</span>     * @param x_crosshairState  crosshair information for the plot<a name="line.412"></a>
<span class="sourceLineNo">413</span>     *                          (&lt;code&gt;null&lt;/code&gt; permitted).<a name="line.413"></a>
<span class="sourceLineNo">414</span>     */<a name="line.414"></a>
<span class="sourceLineNo">415</span>    protected void drawItemPass0(Graphics2D x_graphics,<a name="line.415"></a>
<span class="sourceLineNo">416</span>                                 Rectangle2D x_dataArea,<a name="line.416"></a>
<span class="sourceLineNo">417</span>                                 PlotRenderingInfo x_info,<a name="line.417"></a>
<span class="sourceLineNo">418</span>                                 XYPlot x_plot,<a name="line.418"></a>
<span class="sourceLineNo">419</span>                                 ValueAxis x_domainAxis,<a name="line.419"></a>
<span class="sourceLineNo">420</span>                                 ValueAxis x_rangeAxis,<a name="line.420"></a>
<span class="sourceLineNo">421</span>                                 XYDataset x_dataset,<a name="line.421"></a>
<span class="sourceLineNo">422</span>                                 int x_series,<a name="line.422"></a>
<span class="sourceLineNo">423</span>                                 int x_item,<a name="line.423"></a>
<span class="sourceLineNo">424</span>                                 CrosshairState x_crosshairState) {<a name="line.424"></a>
<span class="sourceLineNo">425</span><a name="line.425"></a>
<span class="sourceLineNo">426</span>        if (!((0 == x_series) &amp;&amp; (0 == x_item))) {<a name="line.426"></a>
<span class="sourceLineNo">427</span>            return;<a name="line.427"></a>
<span class="sourceLineNo">428</span>        }<a name="line.428"></a>
<span class="sourceLineNo">429</span><a name="line.429"></a>
<span class="sourceLineNo">430</span>        boolean b_impliedZeroSubtrahend = (1 == x_dataset.getSeriesCount());<a name="line.430"></a>
<span class="sourceLineNo">431</span><a name="line.431"></a>
<span class="sourceLineNo">432</span>        // check if either series is a degenerate case (i.e. less than 2 points)<a name="line.432"></a>
<span class="sourceLineNo">433</span>        if (isEitherSeriesDegenerate(x_dataset, b_impliedZeroSubtrahend)) {<a name="line.433"></a>
<span class="sourceLineNo">434</span>            return;<a name="line.434"></a>
<span class="sourceLineNo">435</span>        }<a name="line.435"></a>
<span class="sourceLineNo">436</span><a name="line.436"></a>
<span class="sourceLineNo">437</span>        // check if series are disjoint (i.e. domain-spans do not overlap)<a name="line.437"></a>
<span class="sourceLineNo">438</span>        if (!b_impliedZeroSubtrahend &amp;&amp; areSeriesDisjoint(x_dataset)) {<a name="line.438"></a>
<span class="sourceLineNo">439</span>            return;<a name="line.439"></a>
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<span class="sourceLineNo">441</span><a name="line.441"></a>
<span class="sourceLineNo">442</span>        // polygon definitions<a name="line.442"></a>
<span class="sourceLineNo">443</span>        LinkedList l_minuendXs    = new LinkedList();<a name="line.443"></a>
<span class="sourceLineNo">444</span>        LinkedList l_minuendYs    = new LinkedList();<a name="line.444"></a>
<span class="sourceLineNo">445</span>        LinkedList l_subtrahendXs = new LinkedList();<a name="line.445"></a>
<span class="sourceLineNo">446</span>        LinkedList l_subtrahendYs = new LinkedList();<a name="line.446"></a>
<span class="sourceLineNo">447</span>        LinkedList l_polygonXs    = new LinkedList();<a name="line.447"></a>
<span class="sourceLineNo">448</span>        LinkedList l_polygonYs    = new LinkedList();<a name="line.448"></a>
<span class="sourceLineNo">449</span><a name="line.449"></a>
<span class="sourceLineNo">450</span>        // state<a name="line.450"></a>
<span class="sourceLineNo">451</span>        int l_minuendItem      = 0;<a name="line.451"></a>
<span class="sourceLineNo">452</span>        int l_minuendItemCount = x_dataset.getItemCount(0);<a name="line.452"></a>
<span class="sourceLineNo">453</span>        Double l_minuendCurX   = null;<a name="line.453"></a>
<span class="sourceLineNo">454</span>        Double l_minuendNextX  = null;<a name="line.454"></a>
<span class="sourceLineNo">455</span>        Double l_minuendCurY   = null;<a name="line.455"></a>
<span class="sourceLineNo">456</span>        Double l_minuendNextY  = null;<a name="line.456"></a>
<span class="sourceLineNo">457</span>        double l_minuendMaxY   = Double.NEGATIVE_INFINITY;<a name="line.457"></a>
<span class="sourceLineNo">458</span>        double l_minuendMinY   = Double.POSITIVE_INFINITY;<a name="line.458"></a>
<span class="sourceLineNo">459</span><a name="line.459"></a>
<span class="sourceLineNo">460</span>        int l_subtrahendItem      = 0;<a name="line.460"></a>
<span class="sourceLineNo">461</span>        int l_subtrahendItemCount = 0; // actual value set below<a name="line.461"></a>
<span class="sourceLineNo">462</span>        Double l_subtrahendCurX   = null;<a name="line.462"></a>
<span class="sourceLineNo">463</span>        Double l_subtrahendNextX  = null;<a name="line.463"></a>
<span class="sourceLineNo">464</span>        Double l_subtrahendCurY   = null;<a name="line.464"></a>
<span class="sourceLineNo">465</span>        Double l_subtrahendNextY  = null;<a name="line.465"></a>
<span class="sourceLineNo">466</span>        double l_subtrahendMaxY   = Double.NEGATIVE_INFINITY;<a name="line.466"></a>
<span class="sourceLineNo">467</span>        double l_subtrahendMinY   = Double.POSITIVE_INFINITY;<a name="line.467"></a>
<span class="sourceLineNo">468</span><a name="line.468"></a>
<span class="sourceLineNo">469</span>        // if a subtrahend is not specified, assume it is zero<a name="line.469"></a>
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<span class="sourceLineNo">471</span>            l_subtrahendItem      = 0;<a name="line.471"></a>
<span class="sourceLineNo">472</span>            l_subtrahendItemCount = 2;<a name="line.472"></a>
<span class="sourceLineNo">473</span>            l_subtrahendCurX      = new Double(x_dataset.getXValue(0, 0));<a name="line.473"></a>
<span class="sourceLineNo">474</span>            l_subtrahendNextX     = new Double(x_dataset.getXValue(0,<a name="line.474"></a>
<span class="sourceLineNo">475</span>                    (l_minuendItemCount - 1)));<a name="line.475"></a>
<span class="sourceLineNo">476</span>            l_subtrahendCurY      = new Double(0.0);<a name="line.476"></a>
<span class="sourceLineNo">477</span>            l_subtrahendNextY     = new Double(0.0);<a name="line.477"></a>
<span class="sourceLineNo">478</span>            l_subtrahendMaxY      = 0.0;<a name="line.478"></a>
<span class="sourceLineNo">479</span>            l_subtrahendMinY      = 0.0;<a name="line.479"></a>
<span class="sourceLineNo">480</span><a name="line.480"></a>
<span class="sourceLineNo">481</span>            l_subtrahendXs.add(l_subtrahendCurX);<a name="line.481"></a>
<span class="sourceLineNo">482</span>            l_subtrahendYs.add(l_subtrahendCurY);<a name="line.482"></a>
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<span class="sourceLineNo">484</span>        else {<a name="line.484"></a>
<span class="sourceLineNo">485</span>            l_subtrahendItemCount = x_dataset.getItemCount(1);<a name="line.485"></a>
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<span class="sourceLineNo">487</span><a name="line.487"></a>
<span class="sourceLineNo">488</span>        boolean b_minuendDone           = false;<a name="line.488"></a>
<span class="sourceLineNo">489</span>        boolean b_minuendAdvanced       = true;<a name="line.489"></a>
<span class="sourceLineNo">490</span>        boolean b_minuendAtIntersect    = false;<a name="line.490"></a>
<span class="sourceLineNo">491</span>        boolean b_minuendFastForward    = false;<a name="line.491"></a>
<span class="sourceLineNo">492</span>        boolean b_subtrahendDone        = false;<a name="line.492"></a>
<span class="sourceLineNo">493</span>        boolean b_subtrahendAdvanced    = true;<a name="line.493"></a>
<span class="sourceLineNo">494</span>        boolean b_subtrahendAtIntersect = false;<a name="line.494"></a>
<span class="sourceLineNo">495</span>        boolean b_subtrahendFastForward = false;<a name="line.495"></a>
<span class="sourceLineNo">496</span>        boolean b_colinear              = false;<a name="line.496"></a>
<span class="sourceLineNo">497</span><a name="line.497"></a>
<span class="sourceLineNo">498</span>        boolean b_positive;<a name="line.498"></a>
<span class="sourceLineNo">499</span><a name="line.499"></a>
<span class="sourceLineNo">500</span>        // coordinate pairs<a name="line.500"></a>
<span class="sourceLineNo">501</span>        double l_x1 = 0.0, l_y1 = 0.0; // current minuend point<a name="line.501"></a>
<span class="sourceLineNo">502</span>        double l_x2 = 0.0, l_y2 = 0.0; // next minuend point<a name="line.502"></a>
<span class="sourceLineNo">503</span>        double l_x3 = 0.0, l_y3 = 0.0; // current subtrahend point<a name="line.503"></a>
<span class="sourceLineNo">504</span>        double l_x4 = 0.0, l_y4 = 0.0; // next subtrahend point<a name="line.504"></a>
<span class="sourceLineNo">505</span><a name="line.505"></a>
<span class="sourceLineNo">506</span>        // fast-forward through leading tails<a name="line.506"></a>
<span class="sourceLineNo">507</span>        boolean b_fastForwardDone = false;<a name="line.507"></a>
<span class="sourceLineNo">508</span>        while (!b_fastForwardDone) {<a name="line.508"></a>
<span class="sourceLineNo">509</span>            // get the x and y coordinates<a name="line.509"></a>
<span class="sourceLineNo">510</span>            l_x1 = x_dataset.getXValue(0, l_minuendItem);<a name="line.510"></a>
<span class="sourceLineNo">511</span>            l_y1 = x_dataset.getYValue(0, l_minuendItem);<a name="line.511"></a>
<span class="sourceLineNo">512</span>            l_x2 = x_dataset.getXValue(0, l_minuendItem + 1);<a name="line.512"></a>
<span class="sourceLineNo">513</span>            l_y2 = x_dataset.getYValue(0, l_minuendItem + 1);<a name="line.513"></a>
<span class="sourceLineNo">514</span><a name="line.514"></a>
<span class="sourceLineNo">515</span>            l_minuendCurX  = new Double(l_x1);<a name="line.515"></a>
<span class="sourceLineNo">516</span>            l_minuendCurY  = new Double(l_y1);<a name="line.516"></a>
<span class="sourceLineNo">517</span>            l_minuendNextX = new Double(l_x2);<a name="line.517"></a>
<span class="sourceLineNo">518</span>            l_minuendNextY = new Double(l_y2);<a name="line.518"></a>
<span class="sourceLineNo">519</span><a name="line.519"></a>
<span class="sourceLineNo">520</span>            if (b_impliedZeroSubtrahend) {<a name="line.520"></a>
<span class="sourceLineNo">521</span>                l_x3 = l_subtrahendCurX.doubleValue();<a name="line.521"></a>
<span class="sourceLineNo">522</span>                l_y3 = l_subtrahendCurY.doubleValue();<a name="line.522"></a>
<span class="sourceLineNo">523</span>                l_x4 = l_subtrahendNextX.doubleValue();<a name="line.523"></a>
<span class="sourceLineNo">524</span>                l_y4 = l_subtrahendNextY.doubleValue();<a name="line.524"></a>
<span class="sourceLineNo">525</span>            }<a name="line.525"></a>
<span class="sourceLineNo">526</span>            else {<a name="line.526"></a>
<span class="sourceLineNo">527</span>                l_x3 = x_dataset.getXValue(1, l_subtrahendItem);<a name="line.527"></a>
<span class="sourceLineNo">528</span>                l_y3 = x_dataset.getYValue(1, l_subtrahendItem);<a name="line.528"></a>
<span class="sourceLineNo">529</span>                l_x4 = x_dataset.getXValue(1, l_subtrahendItem + 1);<a name="line.529"></a>
<span class="sourceLineNo">530</span>                l_y4 = x_dataset.getYValue(1, l_subtrahendItem + 1);<a name="line.530"></a>
<span class="sourceLineNo">531</span><a name="line.531"></a>
<span class="sourceLineNo">532</span>                l_subtrahendCurX  = new Double(l_x3);<a name="line.532"></a>
<span class="sourceLineNo">533</span>                l_subtrahendCurY  = new Double(l_y3);<a name="line.533"></a>
<span class="sourceLineNo">534</span>                l_subtrahendNextX = new Double(l_x4);<a name="line.534"></a>
<span class="sourceLineNo">535</span>                l_subtrahendNextY = new Double(l_y4);<a name="line.535"></a>
<span class="sourceLineNo">536</span>            }<a name="line.536"></a>
<span class="sourceLineNo">537</span><a name="line.537"></a>
<span class="sourceLineNo">538</span>            if (l_x2 &lt;= l_x3) {<a name="line.538"></a>
<span class="sourceLineNo">539</span>                // minuend needs to be fast forwarded<a name="line.539"></a>
<span class="sourceLineNo">540</span>                l_minuendItem++;<a name="line.540"></a>
<span class="sourceLineNo">541</span>                b_minuendFastForward = true;<a name="line.541"></a>
<span class="sourceLineNo">542</span>                continue;<a name="line.542"></a>
<span class="sourceLineNo">543</span>            }<a name="line.543"></a>
<span class="sourceLineNo">544</span><a name="line.544"></a>
<span class="sourceLineNo">545</span>            if (l_x4 &lt;= l_x1) {<a name="line.545"></a>
<span class="sourceLineNo">546</span>                // subtrahend needs to be fast forwarded<a name="line.546"></a>
<span class="sourceLineNo">547</span>                l_subtrahendItem++;<a name="line.547"></a>
<span class="sourceLineNo">548</span>                b_subtrahendFastForward = true;<a name="line.548"></a>
<span class="sourceLineNo">549</span>                continue;<a name="line.549"></a>
<span class="sourceLineNo">550</span>            }<a name="line.550"></a>
<span class="sourceLineNo">551</span><a name="line.551"></a>
<span class="sourceLineNo">552</span>            // check if initial polygon needs to be clipped<a name="line.552"></a>
<span class="sourceLineNo">553</span>            if ((l_x3 &lt; l_x1) &amp;&amp; (l_x1 &lt; l_x4)) {<a name="line.553"></a>
<span class="sourceLineNo">554</span>                // project onto subtrahend<a name="line.554"></a>
<span class="sourceLineNo">555</span>                double l_slope   = (l_y4 - l_y3) / (l_x4 - l_x3);<a name="line.555"></a>
<span class="sourceLineNo">556</span>                l_subtrahendCurX = l_minuendCurX;<a name="line.556"></a>
<span class="sourceLineNo">557</span>                l_subtrahendCurY = new Double((l_slope * l_x1)<a name="line.557"></a>
<span class="sourceLineNo">558</span>                        + (l_y3 - (l_slope * l_x3)));<a name="line.558"></a>
<span class="sourceLineNo">559</span><a name="line.559"></a>
<span class="sourceLineNo">560</span>                l_subtrahendXs.add(l_subtrahendCurX);<a name="line.560"></a>
<span class="sourceLineNo">561</span>                l_subtrahendYs.add(l_subtrahendCurY);<a name="line.561"></a>
<span class="sourceLineNo">562</span>            }<a name="line.562"></a>
<span class="sourceLineNo">563</span><a name="line.563"></a>
<span class="sourceLineNo">564</span>            if ((l_x1 &lt; l_x3) &amp;&amp; (l_x3 &lt; l_x2)) {<a name="line.564"></a>
<span class="sourceLineNo">565</span>                // project onto minuend<a name="line.565"></a>
<span class="sourceLineNo">566</span>                double l_slope = (l_y2 - l_y1) / (l_x2 - l_x1);<a name="line.566"></a>
<span class="sourceLineNo">567</span>                l_minuendCurX  = l_subtrahendCurX;<a name="line.567"></a>
<span class="sourceLineNo">568</span>                l_minuendCurY  = new Double((l_slope * l_x3)<a name="line.568"></a>
<span class="sourceLineNo">569</span>                        + (l_y1 - (l_slope * l_x1)));<a name="line.569"></a>
<span class="sourceLineNo">570</span><a name="line.570"></a>
<span class="sourceLineNo">571</span>                l_minuendXs.add(l_minuendCurX);<a name="line.571"></a>
<span class="sourceLineNo">572</span>                l_minuendYs.add(l_minuendCurY);<a name="line.572"></a>
<span class="sourceLineNo">573</span>            }<a name="line.573"></a>
<span class="sourceLineNo">574</span><a name="line.574"></a>
<span class="sourceLineNo">575</span>            l_minuendMaxY    = l_minuendCurY.doubleValue();<a name="line.575"></a>
<span class="sourceLineNo">576</span>            l_minuendMinY    = l_minuendCurY.doubleValue();<a name="line.576"></a>
<span class="sourceLineNo">577</span>            l_subtrahendMaxY = l_subtrahendCurY.doubleValue();<a name="line.577"></a>
<span class="sourceLineNo">578</span>            l_subtrahendMinY = l_subtrahendCurY.doubleValue();<a name="line.578"></a>
<span class="sourceLineNo">579</span><a name="line.579"></a>
<span class="sourceLineNo">580</span>            b_fastForwardDone = true;<a name="line.580"></a>
<span class="sourceLineNo">581</span>        }<a name="line.581"></a>
<span class="sourceLineNo">582</span><a name="line.582"></a>
<span class="sourceLineNo">583</span>        // start of algorithm<a name="line.583"></a>
<span class="sourceLineNo">584</span>        while (!b_minuendDone &amp;&amp; !b_subtrahendDone) {<a name="line.584"></a>
<span class="sourceLineNo">585</span>            if (!b_minuendDone &amp;&amp; !b_minuendFastForward &amp;&amp; b_minuendAdvanced) {<a name="line.585"></a>
<span class="sourceLineNo">586</span>                l_x1 = x_dataset.getXValue(0, l_minuendItem);<a name="line.586"></a>
<span class="sourceLineNo">587</span>                l_y1 = x_dataset.getYValue(0, l_minuendItem);<a name="line.587"></a>
<span class="sourceLineNo">588</span>                l_minuendCurX = new Double(l_x1);<a name="line.588"></a>
<span class="sourceLineNo">589</span>                l_minuendCurY = new Double(l_y1);<a name="line.589"></a>
<span class="sourceLineNo">590</span><a name="line.590"></a>
<span class="sourceLineNo">591</span>                if (!b_minuendAtIntersect) {<a name="line.591"></a>
<span class="sourceLineNo">592</span>                    l_minuendXs.add(l_minuendCurX);<a name="line.592"></a>
<span class="sourceLineNo">593</span>                    l_minuendYs.add(l_minuendCurY);<a name="line.593"></a>
<span class="sourceLineNo">594</span>                }<a name="line.594"></a>
<span class="sourceLineNo">595</span><a name="line.595"></a>
<span class="sourceLineNo">596</span>                l_minuendMaxY = Math.max(l_minuendMaxY, l_y1);<a name="line.596"></a>
<span class="sourceLineNo">597</span>                l_minuendMinY = Math.min(l_minuendMinY, l_y1);<a name="line.597"></a>
<span class="sourceLineNo">598</span><a name="line.598"></a>
<span class="sourceLineNo">599</span>                l_x2 = x_dataset.getXValue(0, l_minuendItem + 1);<a name="line.599"></a>
<span class="sourceLineNo">600</span>                l_y2 = x_dataset.getYValue(0, l_minuendItem + 1);<a name="line.600"></a>
<span class="sourceLineNo">601</span>                l_minuendNextX = new Double(l_x2);<a name="line.601"></a>
<span class="sourceLineNo">602</span>                l_minuendNextY = new Double(l_y2);<a name="line.602"></a>
<span class="sourceLineNo">603</span>            }<a name="line.603"></a>
<span class="sourceLineNo">604</span><a name="line.604"></a>
<span class="sourceLineNo">605</span>            // never updated the subtrahend if it is implied to be zero<a name="line.605"></a>
<span class="sourceLineNo">606</span>            if (!b_impliedZeroSubtrahend &amp;&amp; !b_subtrahendDone<a name="line.606"></a>
<span class="sourceLineNo">607</span>                    &amp;&amp; !b_subtrahendFastForward &amp;&amp; b_subtrahendAdvanced) {<a name="line.607"></a>
<span class="sourceLineNo">608</span>                l_x3 = x_dataset.getXValue(1, l_subtrahendItem);<a name="line.608"></a>
<span class="sourceLineNo">609</span>                l_y3 = x_dataset.getYValue(1, l_subtrahendItem);<a name="line.609"></a>
<span class="sourceLineNo">610</span>                l_subtrahendCurX = new Double(l_x3);<a name="line.610"></a>
<span class="sourceLineNo">611</span>                l_subtrahendCurY = new Double(l_y3);<a name="line.611"></a>
<span class="sourceLineNo">612</span><a name="line.612"></a>
<span class="sourceLineNo">613</span>                if (!b_subtrahendAtIntersect) {<a name="line.613"></a>
<span class="sourceLineNo">614</span>                    l_subtrahendXs.add(l_subtrahendCurX);<a name="line.614"></a>
<span class="sourceLineNo">615</span>                    l_subtrahendYs.add(l_subtrahendCurY);<a name="line.615"></a>
<span class="sourceLineNo">616</span>                }<a name="line.616"></a>
<span class="sourceLineNo">617</span><a name="line.617"></a>
<span class="sourceLineNo">618</span>                l_subtrahendMaxY = Math.max(l_subtrahendMaxY, l_y3);<a name="line.618"></a>
<span class="sourceLineNo">619</span>                l_subtrahendMinY = Math.min(l_subtrahendMinY, l_y3);<a name="line.619"></a>
<span class="sourceLineNo">620</span><a name="line.620"></a>
<span class="sourceLineNo">621</span>                l_x4 = x_dataset.getXValue(1, l_subtrahendItem + 1);<a name="line.621"></a>
<span class="sourceLineNo">622</span>                l_y4 = x_dataset.getYValue(1, l_subtrahendItem + 1);<a name="line.622"></a>
<span class="sourceLineNo">623</span>                l_subtrahendNextX = new Double(l_x4);<a name="line.623"></a>
<span class="sourceLineNo">624</span>                l_subtrahendNextY = new Double(l_y4);<a name="line.624"></a>
<span class="sourceLineNo">625</span>            }<a name="line.625"></a>
<span class="sourceLineNo">626</span><a name="line.626"></a>
<span class="sourceLineNo">627</span>            // deassert b_*FastForward (only matters for 1st time through loop)<a name="line.627"></a>
<span class="sourceLineNo">628</span>            b_minuendFastForward    = false;<a name="line.628"></a>
<span class="sourceLineNo">629</span>            b_subtrahendFastForward = false;<a name="line.629"></a>
<span class="sourceLineNo">630</span><a name="line.630"></a>
<span class="sourceLineNo">631</span>            Double l_intersectX = null;<a name="line.631"></a>
<span class="sourceLineNo">632</span>            Double l_intersectY = null;<a name="line.632"></a>
<span class="sourceLineNo">633</span>            boolean b_intersect = false;<a name="line.633"></a>
<span class="sourceLineNo">634</span><a name="line.634"></a>
<span class="sourceLineNo">635</span>            b_minuendAtIntersect    = false;<a name="line.635"></a>
<span class="sourceLineNo">636</span>            b_subtrahendAtIntersect = false;<a name="line.636"></a>
<span class="sourceLineNo">637</span><a name="line.637"></a>
<span class="sourceLineNo">638</span>            // check for intersect<a name="line.638"></a>
<span class="sourceLineNo">639</span>            if ((l_x2 == l_x4) &amp;&amp; (l_y2 == l_y4)) {<a name="line.639"></a>
<span class="sourceLineNo">640</span>                // check if line segments are colinear<a name="line.640"></a>
<span class="sourceLineNo">641</span>                if ((l_x1 == l_x3) &amp;&amp; (l_y1 == l_y3)) {<a name="line.641"></a>
<span class="sourceLineNo">642</span>                    b_colinear = true;<a name="line.642"></a>
<span class="sourceLineNo">643</span>                }<a name="line.643"></a>
<span class="sourceLineNo">644</span>                else {<a name="line.644"></a>
<span class="sourceLineNo">645</span>                    // the intersect is at the next point for both the minuend<a name="line.645"></a>
<span class="sourceLineNo">646</span>                    // and subtrahend<a name="line.646"></a>
<span class="sourceLineNo">647</span>                    l_intersectX = new Double(l_x2);<a name="line.647"></a>
<span class="sourceLineNo">648</span>                    l_intersectY = new Double(l_y2);<a name="line.648"></a>
<span class="sourceLineNo">649</span><a name="line.649"></a>
<span class="sourceLineNo">650</span>                    b_intersect             = true;<a name="line.650"></a>
<span class="sourceLineNo">651</span>                    b_minuendAtIntersect    = true;<a name="line.651"></a>
<span class="sourceLineNo">652</span>                    b_subtrahendAtIntersect = true;<a name="line.652"></a>
<span class="sourceLineNo">653</span>                 }<a name="line.653"></a>
<span class="sourceLineNo">654</span>            }<a name="line.654"></a>
<span class="sourceLineNo">655</span>            else {<a name="line.655"></a>
<span class="sourceLineNo">656</span>                // compute common denominator<a name="line.656"></a>
<span class="sourceLineNo">657</span>                double l_denominator = ((l_y4 - l_y3) * (l_x2 - l_x1))<a name="line.657"></a>
<span class="sourceLineNo">658</span>                        - ((l_x4 - l_x3) * (l_y2 - l_y1));<a name="line.658"></a>
<span class="sourceLineNo">659</span><a name="line.659"></a>
<span class="sourceLineNo">660</span>                // compute common deltas<a name="line.660"></a>
<span class="sourceLineNo">661</span>                double l_deltaY = l_y1 - l_y3;<a name="line.661"></a>
<span class="sourceLineNo">662</span>                double l_deltaX = l_x1 - l_x3;<a name="line.662"></a>
<span class="sourceLineNo">663</span><a name="line.663"></a>
<span class="sourceLineNo">664</span>                // compute numerators<a name="line.664"></a>
<span class="sourceLineNo">665</span>                double l_numeratorA = ((l_x4 - l_x3) * l_deltaY)<a name="line.665"></a>
<span class="sourceLineNo">666</span>                        - ((l_y4 - l_y3) * l_deltaX);<a name="line.666"></a>
<span class="sourceLineNo">667</span>                double l_numeratorB = ((l_x2 - l_x1) * l_deltaY)<a name="line.667"></a>
<span class="sourceLineNo">668</span>                        - ((l_y2 - l_y1) * l_deltaX);<a name="line.668"></a>
<span class="sourceLineNo">669</span><a name="line.669"></a>
<span class="sourceLineNo">670</span>                // check if line segments are colinear<a name="line.670"></a>
<span class="sourceLineNo">671</span>                if ((0 == l_numeratorA) &amp;&amp; (0 == l_numeratorB)<a name="line.671"></a>
<span class="sourceLineNo">672</span>                        &amp;&amp; (0 == l_denominator)) {<a name="line.672"></a>
<span class="sourceLineNo">673</span>                    b_colinear = true;<a name="line.673"></a>
<span class="sourceLineNo">674</span>                }<a name="line.674"></a>
<span class="sourceLineNo">675</span>                else {<a name="line.675"></a>
<span class="sourceLineNo">676</span>                    // check if previously colinear<a name="line.676"></a>
<span class="sourceLineNo">677</span>                    if (b_colinear) {<a name="line.677"></a>
<span class="sourceLineNo">678</span>                        // clear colinear points and flag<a name="line.678"></a>
<span class="sourceLineNo">679</span>                        l_minuendXs.clear();<a name="line.679"></a>
<span class="sourceLineNo">680</span>                        l_minuendYs.clear();<a name="line.680"></a>
<span class="sourceLineNo">681</span>                        l_subtrahendXs.clear();<a name="line.681"></a>
<span class="sourceLineNo">682</span>                        l_subtrahendYs.clear();<a name="line.682"></a>
<span class="sourceLineNo">683</span>                        l_polygonXs.clear();<a name="line.683"></a>
<span class="sourceLineNo">684</span>                        l_polygonYs.clear();<a name="line.684"></a>
<span class="sourceLineNo">685</span><a name="line.685"></a>
<span class="sourceLineNo">686</span>                        b_colinear = false;<a name="line.686"></a>
<span class="sourceLineNo">687</span><a name="line.687"></a>
<span class="sourceLineNo">688</span>                        // set new starting point for the polygon<a name="line.688"></a>
<span class="sourceLineNo">689</span>                        boolean b_useMinuend = ((l_x3 &lt;= l_x1)<a name="line.689"></a>
<span class="sourceLineNo">690</span>                                &amp;&amp; (l_x1 &lt;= l_x4));<a name="line.690"></a>
<span class="sourceLineNo">691</span>                        l_polygonXs.add(b_useMinuend ? l_minuendCurX<a name="line.691"></a>
<span class="sourceLineNo">692</span>                                : l_subtrahendCurX);<a name="line.692"></a>
<span class="sourceLineNo">693</span>                        l_polygonYs.add(b_useMinuend ? l_minuendCurY<a name="line.693"></a>
<span class="sourceLineNo">694</span>                                : l_subtrahendCurY);<a name="line.694"></a>
<span class="sourceLineNo">695</span>                    }<a name="line.695"></a>
<span class="sourceLineNo">696</span><a name="line.696"></a>
<span class="sourceLineNo">697</span>                    // compute slope components<a name="line.697"></a>
<span class="sourceLineNo">698</span>                    double l_slopeA = l_numeratorA / l_denominator;<a name="line.698"></a>
<span class="sourceLineNo">699</span>                    double l_slopeB = l_numeratorB / l_denominator;<a name="line.699"></a>
<span class="sourceLineNo">700</span><a name="line.700"></a>
<span class="sourceLineNo">701</span>                    // check if the line segments intersect<a name="line.701"></a>
<span class="sourceLineNo">702</span>                    if ((0 &lt; l_slopeA) &amp;&amp; (l_slopeA &lt;= 1) &amp;&amp; (0 &lt; l_slopeB)<a name="line.702"></a>
<span class="sourceLineNo">703</span>                            &amp;&amp; (l_slopeB &lt;= 1)) {<a name="line.703"></a>
<span class="sourceLineNo">704</span>                        // compute the point of intersection<a name="line.704"></a>
<span class="sourceLineNo">705</span>                        double l_xi = l_x1 + (l_slopeA * (l_x2 - l_x1));<a name="line.705"></a>
<span class="sourceLineNo">706</span>                        double l_yi = l_y1 + (l_slopeA * (l_y2 - l_y1));<a name="line.706"></a>
<span class="sourceLineNo">707</span><a name="line.707"></a>
<span class="sourceLineNo">708</span>                        l_intersectX            = new Double(l_xi);<a name="line.708"></a>
<span class="sourceLineNo">709</span>                        l_intersectY            = new Double(l_yi);<a name="line.709"></a>
<span class="sourceLineNo">710</span>                        b_intersect             = true;<a name="line.710"></a>
<span class="sourceLineNo">711</span>                        b_minuendAtIntersect    = ((l_xi == l_x2)<a name="line.711"></a>
<span class="sourceLineNo">712</span>                                &amp;&amp; (l_yi == l_y2));<a name="line.712"></a>
<span class="sourceLineNo">713</span>                        b_subtrahendAtIntersect = ((l_xi == l_x4)<a name="line.713"></a>
<span class="sourceLineNo">714</span>                                &amp;&amp; (l_yi == l_y4));<a name="line.714"></a>
<span class="sourceLineNo">715</span><a name="line.715"></a>
<span class="sourceLineNo">716</span>                        // advance minuend and subtrahend to intesect<a name="line.716"></a>
<span class="sourceLineNo">717</span>                        l_minuendCurX    = l_intersectX;<a name="line.717"></a>
<span class="sourceLineNo">718</span>                        l_minuendCurY    = l_intersectY;<a name="line.718"></a>
<span class="sourceLineNo">719</span>                        l_subtrahendCurX = l_intersectX;<a name="line.719"></a>
<span class="sourceLineNo">720</span>                        l_subtrahendCurY = l_intersectY;<a name="line.720"></a>
<span class="sourceLineNo">721</span>                    }<a name="line.721"></a>
<span class="sourceLineNo">722</span>                }<a name="line.722"></a>
<span class="sourceLineNo">723</span>            }<a name="line.723"></a>
<span class="sourceLineNo">724</span><a name="line.724"></a>
<span class="sourceLineNo">725</span>            if (b_intersect) {<a name="line.725"></a>
<span class="sourceLineNo">726</span>                // create the polygon<a name="line.726"></a>
<span class="sourceLineNo">727</span>                // add the minuend's points to polygon<a name="line.727"></a>
<span class="sourceLineNo">728</span>                l_polygonXs.addAll(l_minuendXs);<a name="line.728"></a>
<span class="sourceLineNo">729</span>                l_polygonYs.addAll(l_minuendYs);<a name="line.729"></a>
<span class="sourceLineNo">730</span><a name="line.730"></a>
<span class="sourceLineNo">731</span>                // add intersection point to the polygon<a name="line.731"></a>
<span class="sourceLineNo">732</span>                l_polygonXs.add(l_intersectX);<a name="line.732"></a>
<span class="sourceLineNo">733</span>                l_polygonYs.add(l_intersectY);<a name="line.733"></a>
<span class="sourceLineNo">734</span><a name="line.734"></a>
<span class="sourceLineNo">735</span>                // add the subtrahend's points to the polygon in reverse<a name="line.735"></a>
<span class="sourceLineNo">736</span>                Collections.reverse(l_subtrahendXs);<a name="line.736"></a>
<span class="sourceLineNo">737</span>                Collections.reverse(l_subtrahendYs);<a name="line.737"></a>
<span class="sourceLineNo">738</span>                l_polygonXs.addAll(l_subtrahendXs);<a name="line.738"></a>
<span class="sourceLineNo">739</span>                l_polygonYs.addAll(l_subtrahendYs);<a name="line.739"></a>
<span class="sourceLineNo">740</span><a name="line.740"></a>
<span class="sourceLineNo">741</span>                // create an actual polygon<a name="line.741"></a>
<span class="sourceLineNo">742</span>                b_positive = (l_subtrahendMaxY &lt;= l_minuendMaxY)<a name="line.742"></a>
<span class="sourceLineNo">743</span>                        &amp;&amp; (l_subtrahendMinY &lt;= l_minuendMinY);<a name="line.743"></a>
<span class="sourceLineNo">744</span>                createPolygon(x_graphics, x_dataArea, x_plot, x_domainAxis,<a name="line.744"></a>
<span class="sourceLineNo">745</span>                        x_rangeAxis, b_positive, l_polygonXs, l_polygonYs);<a name="line.745"></a>
<span class="sourceLineNo">746</span><a name="line.746"></a>
<span class="sourceLineNo">747</span>                // clear the point vectors<a name="line.747"></a>
<span class="sourceLineNo">748</span>                l_minuendXs.clear();<a name="line.748"></a>
<span class="sourceLineNo">749</span>                l_minuendYs.clear();<a name="line.749"></a>
<span class="sourceLineNo">750</span>                l_subtrahendXs.clear();<a name="line.750"></a>
<span class="sourceLineNo">751</span>                l_subtrahendYs.clear();<a name="line.751"></a>
<span class="sourceLineNo">752</span>                l_polygonXs.clear();<a name="line.752"></a>
<span class="sourceLineNo">753</span>                l_polygonYs.clear();<a name="line.753"></a>
<span class="sourceLineNo">754</span><a name="line.754"></a>
<span class="sourceLineNo">755</span>                // set the maxY and minY values to intersect y-value<a name="line.755"></a>
<span class="sourceLineNo">756</span>                double l_y       = l_intersectY.doubleValue();<a name="line.756"></a>
<span class="sourceLineNo">757</span>                l_minuendMaxY    = l_y;<a name="line.757"></a>
<span class="sourceLineNo">758</span>                l_subtrahendMaxY = l_y;<a name="line.758"></a>
<span class="sourceLineNo">759</span>                l_minuendMinY    = l_y;<a name="line.759"></a>
<span class="sourceLineNo">760</span>                l_subtrahendMinY = l_y;<a name="line.760"></a>
<span class="sourceLineNo">761</span><a name="line.761"></a>
<span class="sourceLineNo">762</span>                // add interection point to new polygon<a name="line.762"></a>
<span class="sourceLineNo">763</span>                l_polygonXs.add(l_intersectX);<a name="line.763"></a>
<span class="sourceLineNo">764</span>                l_polygonYs.add(l_intersectY);<a name="line.764"></a>
<span class="sourceLineNo">765</span>            }<a name="line.765"></a>
<span class="sourceLineNo">766</span><a name="line.766"></a>
<span class="sourceLineNo">767</span>            // advance the minuend if needed<a name="line.767"></a>
<span class="sourceLineNo">768</span>            if (l_x2 &lt;= l_x4) {<a name="line.768"></a>
<span class="sourceLineNo">769</span>                l_minuendItem++;<a name="line.769"></a>
<span class="sourceLineNo">770</span>                b_minuendAdvanced = true;<a name="line.770"></a>
<span class="sourceLineNo">771</span>            }<a name="line.771"></a>
<span class="sourceLineNo">772</span>            else {<a name="line.772"></a>
<span class="sourceLineNo">773</span>                b_minuendAdvanced = false;<a name="line.773"></a>
<span class="sourceLineNo">774</span>            }<a name="line.774"></a>
<span class="sourceLineNo">775</span><a name="line.775"></a>
<span class="sourceLineNo">776</span>            // advance the subtrahend if needed<a name="line.776"></a>
<span class="sourceLineNo">777</span>            if (l_x4 &lt;= l_x2) {<a name="line.777"></a>
<span class="sourceLineNo">778</span>                l_subtrahendItem++;<a name="line.778"></a>
<span class="sourceLineNo">779</span>                b_subtrahendAdvanced = true;<a name="line.779"></a>
<span class="sourceLineNo">780</span>            }<a name="line.780"></a>
<span class="sourceLineNo">781</span>            else {<a name="line.781"></a>
<span class="sourceLineNo">782</span>                b_subtrahendAdvanced = false;<a name="line.782"></a>
<span class="sourceLineNo">783</span>            }<a name="line.783"></a>
<span class="sourceLineNo">784</span><a name="line.784"></a>
<span class="sourceLineNo">785</span>            b_minuendDone    = (l_minuendItem == (l_minuendItemCount - 1));<a name="line.785"></a>
<span class="sourceLineNo">786</span>            b_subtrahendDone = (l_subtrahendItem == (l_subtrahendItemCount<a name="line.786"></a>
<span class="sourceLineNo">787</span>                    - 1));<a name="line.787"></a>
<span class="sourceLineNo">788</span>        }<a name="line.788"></a>
<span class="sourceLineNo">789</span><a name="line.789"></a>
<span class="sourceLineNo">790</span>        // check if the final polygon needs to be clipped<a name="line.790"></a>
<span class="sourceLineNo">791</span>        if (b_minuendDone &amp;&amp; (l_x3 &lt; l_x2) &amp;&amp; (l_x2 &lt; l_x4)) {<a name="line.791"></a>
<span class="sourceLineNo">792</span>            // project onto subtrahend<a name="line.792"></a>
<span class="sourceLineNo">793</span>            double l_slope    = (l_y4 - l_y3) / (l_x4 - l_x3);<a name="line.793"></a>
<span class="sourceLineNo">794</span>            l_subtrahendNextX = l_minuendNextX;<a name="line.794"></a>
<span class="sourceLineNo">795</span>            l_subtrahendNextY = new Double((l_slope * l_x2)<a name="line.795"></a>
<span class="sourceLineNo">796</span>                    + (l_y3 - (l_slope * l_x3)));<a name="line.796"></a>
<span class="sourceLineNo">797</span>        }<a name="line.797"></a>
<span class="sourceLineNo">798</span><a name="line.798"></a>
<span class="sourceLineNo">799</span>        if (b_subtrahendDone &amp;&amp; (l_x1 &lt; l_x4) &amp;&amp; (l_x4 &lt; l_x2)) {<a name="line.799"></a>
<span class="sourceLineNo">800</span>            // project onto minuend<a name="line.800"></a>
<span class="sourceLineNo">801</span>            double l_slope = (l_y2 - l_y1) / (l_x2 - l_x1);<a name="line.801"></a>
<span class="sourceLineNo">802</span>            l_minuendNextX = l_subtrahendNextX;<a name="line.802"></a>
<span class="sourceLineNo">803</span>            l_minuendNextY = new Double((l_slope * l_x4)<a name="line.803"></a>
<span class="sourceLineNo">804</span>                    + (l_y1 - (l_slope * l_x1)));<a name="line.804"></a>
<span class="sourceLineNo">805</span>        }<a name="line.805"></a>
<span class="sourceLineNo">806</span><a name="line.806"></a>
<span class="sourceLineNo">807</span>        // consider last point of minuend and subtrahend for determining<a name="line.807"></a>
<span class="sourceLineNo">808</span>        // positivity<a name="line.808"></a>
<span class="sourceLineNo">809</span>        l_minuendMaxY    = Math.max(l_minuendMaxY,<a name="line.809"></a>
<span class="sourceLineNo">810</span>                l_minuendNextY.doubleValue());<a name="line.810"></a>
<span class="sourceLineNo">811</span>        l_subtrahendMaxY = Math.max(l_subtrahendMaxY,<a name="line.811"></a>
<span class="sourceLineNo">812</span>                l_subtrahendNextY.doubleValue());<a name="line.812"></a>
<span class="sourceLineNo">813</span>        l_minuendMinY    = Math.min(l_minuendMinY,<a name="line.813"></a>
<span class="sourceLineNo">814</span>                l_minuendNextY.doubleValue());<a name="line.814"></a>
<span class="sourceLineNo">815</span>        l_subtrahendMinY = Math.min(l_subtrahendMinY,<a name="line.815"></a>
<span class="sourceLineNo">816</span>                l_subtrahendNextY.doubleValue());<a name="line.816"></a>
<span class="sourceLineNo">817</span><a name="line.817"></a>
<span class="sourceLineNo">818</span>        // add the last point of the minuned and subtrahend<a name="line.818"></a>
<span class="sourceLineNo">819</span>        l_minuendXs.add(l_minuendNextX);<a name="line.819"></a>
<span class="sourceLineNo">820</span>        l_minuendYs.add(l_minuendNextY);<a name="line.820"></a>
<span class="sourceLineNo">821</span>        l_subtrahendXs.add(l_subtrahendNextX);<a name="line.821"></a>
<span class="sourceLineNo">822</span>        l_subtrahendYs.add(l_subtrahendNextY);<a name="line.822"></a>
<span class="sourceLineNo">823</span><a name="line.823"></a>
<span class="sourceLineNo">824</span>        // create the polygon<a name="line.824"></a>
<span class="sourceLineNo">825</span>        // add the minuend's points to polygon<a name="line.825"></a>
<span class="sourceLineNo">826</span>        l_polygonXs.addAll(l_minuendXs);<a name="line.826"></a>
<span class="sourceLineNo">827</span>        l_polygonYs.addAll(l_minuendYs);<a name="line.827"></a>
<span class="sourceLineNo">828</span><a name="line.828"></a>
<span class="sourceLineNo">829</span>        // add the subtrahend's points to the polygon in reverse<a name="line.829"></a>
<span class="sourceLineNo">830</span>        Collections.reverse(l_subtrahendXs);<a name="line.830"></a>
<span class="sourceLineNo">831</span>        Collections.reverse(l_subtrahendYs);<a name="line.831"></a>
<span class="sourceLineNo">832</span>        l_polygonXs.addAll(l_subtrahendXs);<a name="line.832"></a>
<span class="sourceLineNo">833</span>        l_polygonYs.addAll(l_subtrahendYs);<a name="line.833"></a>
<span class="sourceLineNo">834</span><a name="line.834"></a>
<span class="sourceLineNo">835</span>        // create an actual polygon<a name="line.835"></a>
<span class="sourceLineNo">836</span>        b_positive = (l_subtrahendMaxY &lt;= l_minuendMaxY)<a name="line.836"></a>
<span class="sourceLineNo">837</span>                &amp;&amp; (l_subtrahendMinY &lt;= l_minuendMinY);<a name="line.837"></a>
<span class="sourceLineNo">838</span>        createPolygon(x_graphics, x_dataArea, x_plot, x_domainAxis,<a name="line.838"></a>
<span class="sourceLineNo">839</span>                x_rangeAxis, b_positive, l_polygonXs, l_polygonYs);<a name="line.839"></a>
<span class="sourceLineNo">840</span>    }<a name="line.840"></a>
<span class="sourceLineNo">841</span><a name="line.841"></a>
<span class="sourceLineNo">842</span>    /**<a name="line.842"></a>
<span class="sourceLineNo">843</span>     * Draws the visual representation of a single data item, second pass.  In<a name="line.843"></a>
<span class="sourceLineNo">844</span>     * the second pass, the renderer draws the lines and shapes for the<a name="line.844"></a>
<span class="sourceLineNo">845</span>     * individual points in the two series.<a name="line.845"></a>
<span class="sourceLineNo">846</span>     *<a name="line.846"></a>
<span class="sourceLineNo">847</span>     * @param x_graphics  the graphics device.<a name="line.847"></a>
<span class="sourceLineNo">848</span>     * @param x_dataArea  the area within which the data is being drawn.<a name="line.848"></a>
<span class="sourceLineNo">849</span>     * @param x_info  collects information about the drawing.<a name="line.849"></a>
<span class="sourceLineNo">850</span>     * @param x_plot  the plot (can be used to obtain standard color<a name="line.850"></a>
<span class="sourceLineNo">851</span>     *         information etc).<a name="line.851"></a>
<span class="sourceLineNo">852</span>     * @param x_domainAxis  the domain (horizontal) axis.<a name="line.852"></a>
<span class="sourceLineNo">853</span>     * @param x_rangeAxis  the range (vertical) axis.<a name="line.853"></a>
<span class="sourceLineNo">854</span>     * @param x_dataset  the dataset.<a name="line.854"></a>
<span class="sourceLineNo">855</span>     * @param x_series  the series index (zero-based).<a name="line.855"></a>
<span class="sourceLineNo">856</span>     * @param x_item  the item index (zero-based).<a name="line.856"></a>
<span class="sourceLineNo">857</span>     * @param x_crosshairState  crosshair information for the plot<a name="line.857"></a>
<span class="sourceLineNo">858</span>     *                          (&lt;code&gt;null&lt;/code&gt; permitted).<a name="line.858"></a>
<span class="sourceLineNo">859</span>     */<a name="line.859"></a>
<span class="sourceLineNo">860</span>    protected void drawItemPass1(Graphics2D x_graphics,<a name="line.860"></a>
<span class="sourceLineNo">861</span>                                 Rectangle2D x_dataArea,<a name="line.861"></a>
<span class="sourceLineNo">862</span>                                 PlotRenderingInfo x_info,<a name="line.862"></a>
<span class="sourceLineNo">863</span>                                 XYPlot x_plot,<a name="line.863"></a>
<span class="sourceLineNo">864</span>                                 ValueAxis x_domainAxis,<a name="line.864"></a>
<span class="sourceLineNo">865</span>                                 ValueAxis x_rangeAxis,<a name="line.865"></a>
<span class="sourceLineNo">866</span>                                 XYDataset x_dataset,<a name="line.866"></a>
<span class="sourceLineNo">867</span>                                 int x_series,<a name="line.867"></a>
<span class="sourceLineNo">868</span>                                 int x_item,<a name="line.868"></a>
<span class="sourceLineNo">869</span>                                 CrosshairState x_crosshairState) {<a name="line.869"></a>
<span class="sourceLineNo">870</span><a name="line.870"></a>
<span class="sourceLineNo">871</span>        Shape l_entityArea = null;<a name="line.871"></a>
<span class="sourceLineNo">872</span>        EntityCollection l_entities = null;<a name="line.872"></a>
<span class="sourceLineNo">873</span>        if (null != x_info) {<a name="line.873"></a>
<span class="sourceLineNo">874</span>            l_entities = x_info.getOwner().getEntityCollection();<a name="line.874"></a>
<span class="sourceLineNo">875</span>        }<a name="line.875"></a>
<span class="sourceLineNo">876</span><a name="line.876"></a>
<span class="sourceLineNo">877</span>        Paint l_seriesPaint   = getItemPaint(x_series, x_item);<a name="line.877"></a>
<span class="sourceLineNo">878</span>        Stroke l_seriesStroke = getItemStroke(x_series, x_item);<a name="line.878"></a>
<span class="sourceLineNo">879</span>        x_graphics.setPaint(l_seriesPaint);<a name="line.879"></a>
<span class="sourceLineNo">880</span>        x_graphics.setStroke(l_seriesStroke);<a name="line.880"></a>
<span class="sourceLineNo">881</span><a name="line.881"></a>
<span class="sourceLineNo">882</span>        PlotOrientation l_orientation      = x_plot.getOrientation();<a name="line.882"></a>
<span class="sourceLineNo">883</span>        RectangleEdge l_domainAxisLocation = x_plot.getDomainAxisEdge();<a name="line.883"></a>
<span class="sourceLineNo">884</span>        RectangleEdge l_rangeAxisLocation  = x_plot.getRangeAxisEdge();<a name="line.884"></a>
<span class="sourceLineNo">885</span><a name="line.885"></a>
<span class="sourceLineNo">886</span>        double l_x0 = x_dataset.getXValue(x_series, x_item);<a name="line.886"></a>
<span class="sourceLineNo">887</span>        double l_y0 = x_dataset.getYValue(x_series, x_item);<a name="line.887"></a>
<span class="sourceLineNo">888</span>        double l_x1 = x_domainAxis.valueToJava2D(l_x0, x_dataArea,<a name="line.888"></a>
<span class="sourceLineNo">889</span>                l_domainAxisLocation);<a name="line.889"></a>
<span class="sourceLineNo">890</span>        double l_y1 = x_rangeAxis.valueToJava2D(l_y0, x_dataArea,<a name="line.890"></a>
<span class="sourceLineNo">891</span>                l_rangeAxisLocation);<a name="line.891"></a>
<span class="sourceLineNo">892</span><a name="line.892"></a>
<span class="sourceLineNo">893</span>        if (getShapesVisible()) {<a name="line.893"></a>
<span class="sourceLineNo">894</span>            Shape l_shape = getItemShape(x_series, x_item);<a name="line.894"></a>
<span class="sourceLineNo">895</span>            if (l_orientation == PlotOrientation.HORIZONTAL) {<a name="line.895"></a>
<span class="sourceLineNo">896</span>                l_shape = ShapeUtilities.createTranslatedShape(l_shape,<a name="line.896"></a>
<span class="sourceLineNo">897</span>                        l_y1, l_x1);<a name="line.897"></a>
<span class="sourceLineNo">898</span>            }<a name="line.898"></a>
<span class="sourceLineNo">899</span>            else {<a name="line.899"></a>
<span class="sourceLineNo">900</span>                l_shape = ShapeUtilities.createTranslatedShape(l_shape,<a name="line.900"></a>
<span class="sourceLineNo">901</span>                        l_x1, l_y1);<a name="line.901"></a>
<span class="sourceLineNo">902</span>            }<a name="line.902"></a>
<span class="sourceLineNo">903</span>            if (l_shape.intersects(x_dataArea)) {<a name="line.903"></a>
<span class="sourceLineNo">904</span>                x_graphics.setPaint(getItemPaint(x_series, x_item));<a name="line.904"></a>
<span class="sourceLineNo">905</span>                x_graphics.fill(l_shape);<a name="line.905"></a>
<span class="sourceLineNo">906</span>            }<a name="line.906"></a>
<span class="sourceLineNo">907</span>            l_entityArea = l_shape;<a name="line.907"></a>
<span class="sourceLineNo">908</span>        }<a name="line.908"></a>
<span class="sourceLineNo">909</span><a name="line.909"></a>
<span class="sourceLineNo">910</span>        // add an entity for the item...<a name="line.910"></a>
<span class="sourceLineNo">911</span>        if (null != l_entities) {<a name="line.911"></a>
<span class="sourceLineNo">912</span>            if (null == l_entityArea) {<a name="line.912"></a>
<span class="sourceLineNo">913</span>                l_entityArea = new Rectangle2D.Double((l_x1 - 2), (l_y1 - 2),<a name="line.913"></a>
<span class="sourceLineNo">914</span>                        4, 4);<a name="line.914"></a>
<span class="sourceLineNo">915</span>            }<a name="line.915"></a>
<span class="sourceLineNo">916</span>            String l_tip = null;<a name="line.916"></a>
<span class="sourceLineNo">917</span>            XYToolTipGenerator l_tipGenerator = getToolTipGenerator(x_series,<a name="line.917"></a>
<span class="sourceLineNo">918</span>                    x_item);<a name="line.918"></a>
<span class="sourceLineNo">919</span>            if (null != l_tipGenerator) {<a name="line.919"></a>
<span class="sourceLineNo">920</span>                l_tip = l_tipGenerator.generateToolTip(x_dataset, x_series,<a name="line.920"></a>
<span class="sourceLineNo">921</span>                        x_item);<a name="line.921"></a>
<span class="sourceLineNo">922</span>            }<a name="line.922"></a>
<span class="sourceLineNo">923</span>            String l_url = null;<a name="line.923"></a>
<span class="sourceLineNo">924</span>            XYURLGenerator l_urlGenerator = getURLGenerator();<a name="line.924"></a>
<span class="sourceLineNo">925</span>            if (null != l_urlGenerator) {<a name="line.925"></a>
<span class="sourceLineNo">926</span>                l_url = l_urlGenerator.generateURL(x_dataset, x_series,<a name="line.926"></a>
<span class="sourceLineNo">927</span>                        x_item);<a name="line.927"></a>
<span class="sourceLineNo">928</span>            }<a name="line.928"></a>
<span class="sourceLineNo">929</span>            XYItemEntity l_entity = new XYItemEntity(l_entityArea, x_dataset,<a name="line.929"></a>
<span class="sourceLineNo">930</span>                    x_series, x_item, l_tip, l_url);<a name="line.930"></a>
<span class="sourceLineNo">931</span>            l_entities.add(l_entity);<a name="line.931"></a>
<span class="sourceLineNo">932</span>        }<a name="line.932"></a>
<span class="sourceLineNo">933</span><a name="line.933"></a>
<span class="sourceLineNo">934</span>        // draw the item label if there is one...<a name="line.934"></a>
<span class="sourceLineNo">935</span>        if (isItemLabelVisible(x_series, x_item)) {<a name="line.935"></a>
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<span class="sourceLineNo">992</span>     *<a name="line.992"></a>
<span class="sourceLineNo">993</span>     * @param x_dataset  the dataset.<a name="line.993"></a>
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<span class="sourceLineNo">1014</span>     *<a name="line.1014"></a>
<span class="sourceLineNo">1015</span>     * @param x_graphics  the graphics device.<a name="line.1015"></a>
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<span class="sourceLineNo">1030</span>                                XYPlot x_plot,<a name="line.1030"></a>
<span class="sourceLineNo">1031</span>                                ValueAxis x_domainAxis,<a name="line.1031"></a>
<span class="sourceLineNo">1032</span>                                ValueAxis x_rangeAxis,<a name="line.1032"></a>
<span class="sourceLineNo">1033</span>                                boolean x_positive,<a name="line.1033"></a>
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<span class="sourceLineNo">1036</span><a name="line.1036"></a>
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<span class="sourceLineNo">1113</span>     *<a name="line.1113"></a>
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<span class="sourceLineNo">1116</span>     *<a name="line.1116"></a>
<span class="sourceLineNo">1117</span>     * @return A legend item for the series.<a name="line.1117"></a>
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<span class="sourceLineNo">1180</span>        XYDifferenceRenderer that = (XYDifferenceRenderer) obj;<a name="line.1180"></a>
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<span class="sourceLineNo">1201</span>     *<a name="line.1201"></a>
<span class="sourceLineNo">1202</span>     * @return A clone.<a name="line.1202"></a>
<span class="sourceLineNo">1203</span>     *<a name="line.1203"></a>
<span class="sourceLineNo">1204</span>     * @throws CloneNotSupportedException  if the renderer cannot be cloned.<a name="line.1204"></a>
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<span class="sourceLineNo">1208</span>        clone.legendLine = ShapeUtilities.clone(this.legendLine);<a name="line.1208"></a>
<span class="sourceLineNo">1209</span>        return clone;<a name="line.1209"></a>
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<span class="sourceLineNo">1230</span>     *<a name="line.1230"></a>
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<span class="sourceLineNo">1236</span>        stream.defaultReadObject();<a name="line.1236"></a>
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<span class="sourceLineNo">1238</span>        this.negativePaint = SerialUtilities.readPaint(stream);<a name="line.1238"></a>
<span class="sourceLineNo">1239</span>        this.legendLine = SerialUtilities.readShape(stream);<a name="line.1239"></a>
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<span class="sourceLineNo">1242</span>}<a name="line.1242"></a>




























































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